With regards to the 'elephant racing' on dual carriageways, 95% of HGV drivers fail to remember its a 50mph limt on dual carriageways and drive on their speed limiters (its 60 on motorways, but obviously they're restricted to 56mph or 90km/h by european law). I always sit at 50mph on dual carriageways, partly because its law, partly because were satelite tracked 24/7 but mainly as it gives me chance to pass slower vehicles with ease, by briefly speeding up to 56 to get by.